Many delivery mechanisms for explosives aren't regulated because like everything it requires a cost benefit analysis. Can we effectively prevent bad actors fro

Many delivery mechanisms for explosives aren't regulated because like everything it requires a cost benefit analysis. Can we effectively prevent bad actors from acquiring them without too much cost to everyone else? (plus how bad is it if bad actors acquire them) For some things the answer is yes : rockets, missiles etc... For others no: slingshots, skateboards, lawnmowers, scooters, remote control cars etc.... Drones are too easy to build to effectively prevent bad actors from acquiring them without a huge cost to society as a whole. Restricting all the components you'd need to prevent a terrorist from building their own drone is just too disruptive. Less restrictive regulations like requiring licensing may be effective for other purposes, but not for preventing drone terrorism.